jb weld holds up

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

eg_feyen - 09 Jun 2006 12:50 GMT

alright guys here it is i went in and tore apart the block on tuesday found
my leak...(wasnt hard to find I dumped in water and watched it come out of
the block as fast as i put it in) I patched the crack using jb welds
regular bond so far it has held up with no leak it will withstand
temperatures of 500 degreees celcius. I cleaned the bonding surface with
mineral spirits then applied it very heavily. Let it cure for 24 hours
and bam I was back to work on thursday.. Thanks for your opinions and
hints.
Eric

Reply to this Message

HLS@nospam.nix - 09 Jun 2006 13:43 GMT

> alright guys here it is i went in and tore apart the block on tuesday found
> my leak...(wasnt hard to find I dumped in water and watched it come out of
[quoted text clipped - 5 lines]
> hints.
> Eric

Let me give you another little tip. When you have a crack that you want to
repair,
you should think about drilling the end of the crack out. Think of the
crack as a
V shape. At the bottom of the V, the mechanical stress can be enormous, and
it is
called a 'stress raiser'. If you drill a small hole there, you redistribute
the stress
around the circumference of a circle and reduce the likelihood that it will
propagate.

Then you fill the hole with JB, or braze, or solder, or whatever you want to
do.

This same concept is used when repairing all sorts of crack damage.

Reply to this Message

eg_feyen - 09 Jun 2006 14:34 GMT

basically a beveled weld.. good point!

Reply to this Message

HLS@nospam.nix - 09 Jun 2006 20:03 GMT

> basically a beveled weld.. good point!

More than a bevel, actually. You drill all the way through the piece, to
remove
the crevice. The crack propagates at the very pit of the crevice, and when
you
drill it out, you make it possible for your filler - of whatever type - to
function
best.

Reply to this Message

Al Bundy - 09 Jun 2006 21:50 GMT

> > basically a beveled weld.. good point!
>
[quoted text clipped - 5 lines]
> function
> best.

And the same idea applies to cracked plastic or glass. I wish the
poster the same success that many of us have had. Temperature won't be
a problem as the slow cure formula is good for 600°F. The only true
failure mode I've noticed with JB and other epoxies is popping off a
surface over a period of time. That could apply to a crack that is
moving as well so relieving the stress is a great idea.

Reply to this Message

Homie Jay Simpson - 11 Jun 2006 15:00 GMT

> basically a beveled weld.. good point!

I would suggest you take it apart again, and drill it out. Then put it back
together again.

Reply to this Message